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Regularity for Fully Nonlinear Integro-differential Operators with Regularly Varying Kernels

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Abstract

In this paper, the regularity results for the integro-differential operators of the fractional Laplacian type by Caffarelli and Silvestre (Comm. Pure Appl. Math. 62, 597–638, 2009) are extended to those for the integro-differential operators associated with symmetric, regularly varying kernels at zero. In particular, we obtain the uniform Harnack inequality and Hölder estimate of viscosity solutions to the nonlinear integro-differential equations associated with the kernels K σ,β satisfying

$$K_{\sigma,\beta}(y)\asymp\frac{ 2-\sigma}{|y|^{n+\sigma}}\left( \log\frac{2}{|y|^{2}}\right)^{\beta(2-\sigma)} \text{near zero} $$

with respect to σ ∈ (0, 2) close to 2 (for a given \(\beta \in \mathbb R\)), where the regularity estimates do not blow up as the order σ ∈ (0, 2) tends to 2.

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Kim, S., Kim, YC. & Lee, KA. Regularity for Fully Nonlinear Integro-differential Operators with Regularly Varying Kernels. Potential Anal 44, 673–705 (2016). https://doi.org/10.1007/s11118-015-9525-y

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